Manual Heating And Air Conditioning System; Fan Speed Control; Mode Selector Control - Ford 1999 F150 Owner's Manual

Controls and features
Manual heating and air conditioning system (if equipped)

Fan speed control

Controls the volume of air circulated
in the vehicle.
Temperature control knob
Controls the temperature of the
airflow inside the vehicle.

Mode selector control

Controls the direction of the airflow
to the inside of the vehicle.
The air conditioning compressor will operate in all modes except PANEL
and FLOOR. However, the air conditioning will only function if the
outside temperature is about 10°C (50°F) or above.
Since the air conditioner removes considerable moisture from the air
during operation, it is normal if clear water drips on the ground under
the air conditioner drain while the system is working and even after you
have stopped the vehicle.
Under normal conditions, your vehicle's climate control system should be
left in any position other than MAX A/C or OFF when the vehicle is
parked. This allows the vehicle to "breathe" through the outside air inlet
duct.
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PANEL
A/C
MAX
A/C
COOL WARM
COOL WARM
PANEL
A/C
MAX
A/C